<style>
    #TEXTAREA { grid-gap: 100%; inline-size: 0px; }
</style>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();

    window.onload = () => {
        TEXTAREA.style.setProperty("column-width", "1px");
        TEXTAREA.style.setProperty("padding", "0px 1px 0px 0px");
    }
</script>
<body><span>Test negative column gap. The test passes if WebKit doesn't crash or hit an assertion.</span><textarea id=TEXTAREA><span></span></textarea>